

var DIF_dragging=false;
var DIF_iframeBeingDragged="";
var DIF_iframeObjects=new Object();
var DIF_iframeWindows=new Object();
var DIF_iframeMouseDownLeft = new Object();
var DIF_iframeMouseDownTop = new Object();
var DIF_pageMouseDownLeft = new Object();
var DIF_pageMouseDownTop = new Object();
var DIF_handles = new Object();
var DIF_highestZIndex=99;
var DIF_raiseSelectedIframe=false;
var DIF_allowDragOffScreen=false;

function bringSelectedIframeToTop(val) {
	DIF_raiseSelectedIframe = val;
	}
	

function allowDragOffScreen(val) {
	DIF_allowDragOffScreen=val;
	}


function addHandle(o, win) {
	if (arguments.length==2 && win==window) {
	
		var p = win;
		while (p=p.parent) {
			if (p.addHandle) { p.addHandle(o,win,true); return; }
			if (p==win.top) { return; } 
			}
		return; 
		}
	var topRef=win;
	var topRefStr = "window";
	while (topRef.parent && topRef.parent!=window) {
		topRef = topRef.parent;
		topRefStr = topRefStr + ".parent";
		}
	
	if (typeof(win.DIF_mainHandlersAdded)=="undefined" || !win.DIF_mainHandlersAdded) {
		
		with (win) { 
			eval("function OnMouseDownHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_begindrag(evt, "+topRefStr+") }");
			eval("document.onmousedown = OnMouseDownHandler;");
			eval("function OnMouseUpHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_enddrag(evt, "+topRefStr+") }");
			eval("document.onmouseup = OnMouseUpHandler;");
			eval("function OnMouseMoveHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_iframemove(evt, "+topRefStr+") }");
			eval("document.onmousemove = OnMouseMoveHandler;");
			win.DIF_handlersAdded = true;
			win.DIF_mainHandlersAdded = true;
			}
		}
	
	if (typeof(window.DIF_handlersAdded)!="undefined" || !window.DIF_handlersAdded) {
		eval("function OnMouseMoveHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}DIF_mouseMove(evt, window) }");
		eval("document.onmousemove = OnMouseMoveHandler;");
		window.DIF_handlersAdded=true;
		}
	o.style.cursor="move";
	var name = DIF_getIframeId(topRef);
	if (DIF_handles[name]==null) {
	
		DIF_handles[name] = new Array();
		DIF_iframeMouseDownLeft[name] = 0;
		DIF_iframeMouseDownTop[name] = 0;
		DIF_pageMouseDownLeft[name] = 0;
		DIF_pageMouseDownTop[name] = 0;
		}
	DIF_handles[name][DIF_handles[name].length] = o;
	}


function DIF_getEventPosition(evt) {
	var pos=new Object();
	pos.x=0;
	pos.y=0;
	if (!evt) {
		evt = window.event;
		}
	if (typeof(evt.pageX) == 'number') {
		pos.x = evt.pageX;
		pos.y = evt.pageY;
	}
	else {
		pos.x = evt.clientX;
		pos.y = evt.clientY;
		if (!top.opera) {
			if ((!window.document.compatMode) || (window.document.compatMode == 'BackCompat')) {
				pos.x += window.document.body.scrollLeft;
				pos.y += window.document.body.scrollTop;
			}
			else {
				pos.x += window.document.documentElement.scrollLeft;
				pos.y += window.document.documentElement.scrollTop;
			}
		}
	}
	return pos;
}


function DIF_getIframeId(win) {
	
	var iframes = document.getElementsByTagName("IFRAME");
	for (var i=0; i<iframes.length; i++) {
		var o = iframes.item(i);
		var w = null;
		if (o.contentWindow) {
			// For IE5.5 and IE6
			w = o.contentWindow;
			}
		else if (window.frames && window.frames[o.id].window) {
			w = window.frames[o.id];
			}
		if (w == win) {
			DIF_iframeWindows[o.id] = win;
			DIF_iframeObjects[o.id] = o;
			return o.id; 
			}
		}
	return null;
	}


function DIF_getObjectXY(o) {
	var res = new Object();
	res.x=0; res.y=0;
	if (o != null) {
		res.x = o.style.left.substring(0,o.style.left.indexOf("px"));
		res.y = o.style.top.substring(0,o.style.top.indexOf("px"));
		}
	return res;
	}


function getSrcElement(e) {
	var tgt = e.target;
	while (tgt.nodeType != 1) { tgt = tgt.parentNode; }
	return tgt;
	}


function isHandleClicked(handle, objectClicked) {
	if (handle==objectClicked) { return true; }
	while (objectClicked.parentNode != null) {
		if (objectClicked==handle) {
			return true;
			}
		objectClicked = objectClicked.parentNode;
		}
	return false;
	}
	

function DIF_begindrag(e, win) {
	
	var iframename = DIF_getIframeId(win);
	if (iframename==null) { return; }

	if (DIF_handles[iframename]==null || DIF_handles[iframename].length<1) {
		return;
		}
	var isHandle = false;
	var t = e.srcElement || getSrcElement(e);
	for (var i=0; i<DIF_handles[iframename].length; i++) {
		if (isHandleClicked(DIF_handles[iframename][i],t)) {
			isHandle=true;
			break;
			}
		}
	if (!isHandle) { return false; }
	DIF_iframeBeingDragged = iframename;
	if (DIF_raiseSelectedIframe) {
		DIF_iframeObjects[DIF_iframeBeingDragged].style.zIndex=DIF_highestZIndex++;
		}
	DIF_dragging=true;
	var pos=DIF_getEventPosition(e);
	DIF_iframeMouseDownLeft[DIF_iframeBeingDragged] = pos.x;
	DIF_iframeMouseDownTop[DIF_iframeBeingDragged] = pos.y;
	var o = DIF_getObjectXY(DIF_iframeObjects[DIF_iframeBeingDragged]);
	DIF_pageMouseDownLeft[DIF_iframeBeingDragged] = o.x - 0 + pos.x;
	DIF_pageMouseDownTop[DIF_iframeBeingDragged] = o.y -0 + pos.y;
	}


function DIF_enddrag(e) {
	DIF_dragging=false;
	DIF_iframeBeingDragged="";
	}


function DIF_mouseMove(e) {
	if (DIF_dragging) {
		var pos = DIF_getEventPosition(e);
		DIF_drag(pos.x - DIF_pageMouseDownLeft[DIF_iframeBeingDragged] , pos.y - DIF_pageMouseDownTop[DIF_iframeBeingDragged]);
		}
	}


function DIF_iframemove(e) {
	if (DIF_dragging) {
		var pos = DIF_getEventPosition(e);
		DIF_drag(pos.x - DIF_iframeMouseDownLeft[DIF_iframeBeingDragged] , pos.y - DIF_iframeMouseDownTop[DIF_iframeBeingDragged]);
		}
	}


function DIF_drag(x,y) {
	var o = DIF_getObjectXY(DIF_iframeObjects[DIF_iframeBeingDragged]);

	var newPositionX = o.x-0+x;
	var newPositionY = o.y-0+y;
	if (!DIF_allowDragOffScreen) {
		if (newPositionX < 0) { newPositionX=0; }
		if (newPositionY < 0) { newPositionY=0; }
		}
	DIF_iframeObjects[DIF_iframeBeingDragged].style.left = newPositionX + "px";
	DIF_iframeObjects[DIF_iframeBeingDragged].style.top  = newPositionY + "px";
	DIF_pageMouseDownLeft[DIF_iframeBeingDragged] += x;
	DIF_pageMouseDownTop[DIF_iframeBeingDragged] += y;
	}
